abse/smartwatch-flex-top-only

scripts/export-mount-fit-sample.py

"""Crop real mounting solids into a small, separately printed fit-test set."""
from pathlib import Path
import hashlib, json
import trimesh
from mount_mesh_utils import printable_mesh

root = Path(__file__).resolve().parent.parent

def box(bounds):
    lo, hi = bounds
    return trimesh.creation.box(
        extents=[b-a for a,b in zip(lo,hi)],
        transform=trimesh.transformations.translation_matrix([(a+b)/2 for a,b in zip(lo,hi)]))

region = box([[14.8,-22.7,-10], [18.7,-15.4,2.1]])
outputs = []
for source, target in [
    ('mounted-enclosure.stl','mount-fit-case-post.stl'),
    ('pcb-mounting-cradle.stl','mount-fit-cradle-corner.stl'),
    ('retainer-front-right.stl','mount-fit-retainer.stl'),
]:
    mesh = trimesh.load(root/'mechanical'/source)
    mesh.merge_vertices(merge_tex=True,merge_norm=True)
    cropped = trimesh.boolean.intersection([mesh,region],engine='manifold')
    assert cropped.is_volume and cropped.body_count == 1, target
    # Common translation preserves assembled alignment; slicers may place each
    # part on their bed separately. These are samples, never assembly assets.
    cropped.apply_translation([-16.5,20.5,9.42])
    path = 'mechanical/'+target
    cropped=printable_mesh(cropped)
    cropped.export(root/path)
    emitted=trimesh.load(root/path);assert emitted.is_volume and emitted.body_count==1,target
    outputs.append({'file':path,'watertight':True,'solidCount':1,
        'sha256':hashlib.sha256((root/path).read_bytes()).hexdigest()})

report = {'status':'PASS','version':'0.2.10','files':outputs,
    'sourceRegionMM':[[14.8,-22.7,-10],[18.7,-15.4,2.1]],
    'assemblyTranslationMM':[-16.5,20.5,9.42],
    'instructions':'Print separately. Finish the 1.3mm pilot and tap M1.6 x 0.35; finish the 1.9mm clearance bore and countersink. Use a purchased M1.6 x 6 countersunk screw. Check fit with an actual 0.65mm PCB/stiffener sample; do not substitute a printed gauge for measured PCB thickness. Reject cracking, stripped threads, rocking or excessive force.',
    'qualification':'Geometry-derived test coupon; printing, thread strength and fit have not been physically tested.'}
(root/'reports/mount-fit-sample.json').write_text(json.dumps(report,indent=2)+'\n')
print(json.dumps(report,indent=2))